vault-0.3.1.2: a persistent store for values of arbitrary types

Safe Haskell	None
Language	Haskell98

Data.Vault.ST.Lazy

Contents

Vault
Locker

Description

A persistent store for values of arbitrary types. Variant for the ST monad.

The Vault type in this module is strict in the keys but lazy in the values.

Synopsis

data Vault s
data Key s a
empty :: Vault s
newKey :: ST s (Key s a)
lookup :: Key s a -> Vault s -> Maybe a
insert :: Key s a -> a -> Vault s -> Vault s
adjust :: (a -> a) -> Key s a -> Vault s -> Vault s
delete :: Key s a -> Vault s -> Vault s
union :: Vault s -> Vault s -> Vault s
data Locker s
lock :: Key s a -> a -> Locker s
unlock :: Key s a -> Locker s -> Maybe a

Vault

data Vault s Source #

Instances

Semigroup (Vault s) #
Instance details Defined in Data.Vault.ST.Lazy Methods (<>) :: Vault s -> Vault s -> Vault s # sconcat :: NonEmpty (Vault s) -> Vault s # stimes :: Integral b => b -> Vault s -> Vault s #
Monoid (Vault s) #
Instance details Defined in Data.Vault.ST.Lazy Methods mempty :: Vault s # mappend :: Vault s -> Vault s -> Vault s # mconcat :: [Vault s] -> Vault s #

data Key s a Source #

empty :: Vault s Source #

The empty vault.

newKey :: ST s (Key s a) Source #

Create a new key for use with a vault.

lookup :: Key s a -> Vault s -> Maybe a Source #

Lookup the value of a key in the vault.

insert :: Key s a -> a -> Vault s -> Vault s Source #

Insert a value for a given key. Overwrites any previous value.

adjust :: (a -> a) -> Key s a -> Vault s -> Vault s Source #

Adjust the value for a given key if it's present in the vault.

delete :: Key s a -> Vault s -> Vault s Source #

Delete a key from the vault.

union :: Vault s -> Vault s -> Vault s Source #

Merge two vaults (left-biased).

Locker

data Locker s Source #

lock :: Key s a -> a -> Locker s Source #

Put a single value into a Locker.

unlock :: Key s a -> Locker s -> Maybe a Source #

Retrieve the value from the Locker.